### How can have the Filter Designer's "Overlay Spectrum" feature

I like the Filter Designer's "Overlay Spectrum" feature, but now I'd like to use the FDATool instead, and cannot figure out how to do the analogous thing in the FDATool.

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I like the Filter Designer's "Overlay Spectrum" feature, but now I'd like to use the FDATool instead, and cannot figure out how to do the analogous thing in the FDATool.

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The ability to overlay spectrums is not available in the FDATool in the Signal Processing Toolbox.

As a workaround, you can use the FDATool's "User-defined Spectral Mask" feature to display the spectum. Here, the "mtlb" signal will be used as an example.

After you have a version of the filter designed (so it is showing the magnitude response):

1. In the SPTool, use File->Export... to export the "mtlbse" spectrum to the base workspace.

2. Execute the following in the command window:

pvals = mtlbse.P((mtlbse.f>=0) & (mtlbse.f<=mtlbse.Fs/2)); fvals = mtlbse.f((mtlbse.f>=0) & (mtlbse.f<=mtlbse.Fs/2)); freq = fvals/(mtlbse.Fs/2); mag = 20*log10(pvals);

Here, the variables "freq" and "mag" represent the spectrum, trimmed to the visible area and configured to have the default frequency and magnitude units.

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